Soonest time I can get a blood test to test for pregnancy

Patient : What's the soonest time i can get a blood test to test for pregnancy?
Doctor :   A pregnancy test attempts to determine whether a woman is pregnant. Markers that indicate pregnancy are found in urine a nd blood, and pregnancy tests require sampling one of these substances. These markers are hormones secreted after fertilisation. The human chorionic gonadotropin (hCG), is one such marker that is be produced by the trophoblast cells of the fertilised ova (eggs). While hCG is a reliable marker of pregnancy, it cannot be detected until after implantation. This results in possible false negatives if the test is performed during the very early stages of pregnancy. Most chemical tests for pregnancy look for the presence of the beta subunit of hCG, or human chorionic gonadotropin, in the blood or urine. hCG can be detected in urine or blood after implantation, which occurs six to twelve days after fertilization. Obstetric ultrasonography may also be used to detect pregnancy. With obstetric ultrasonography the gestational sac sometimes can be visualized as early as four and a half weeks of gestation (approximately two and a half weeks after ovulation) and the yolk sac at about five weeks' gestation. The embryo can be observed and measured by about five and a half weeks. The heartbeat may be seen as early as six weeks, and is usually visible by seven weeks' gestation. The test for pregnancy which can give the quickest result after fertilisation is a rosette inhibition assay for early pregnancy factor (EPF). EPF can be detected in blood within 48 hours of fertilization. However, testing for EPF is expensive and time-consuming. Pregnancy occurring as a result of an unprotected intercourse is at its maximum in the so called "fertile period" of a woman which is determined by analyzing her menstrual cycle with an ovulation calculator or fertility chart. Normally, the menstrual cycle is a 28 day cycle. During the 14th day after a period, the ovum is released. This process is called ovulation and the days 12 to 16 days after a period are said to be a woman’s most fertile period. As already explained hCG can be detected in urine or blood after implantation, which occurs six to twelve days after fertilization.

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